Bass string winding Tension

[Joe And Penny Goss]

Hi Tony,
I think that I see what you are trying to say.
Question, would one get a straight string if the core wire were not
straightened? And does the string that is made on a straightened core wire
hang to the left in the northern hemisphere and to the right down under?
All kidding aside is there a real difference that one can notice?
Joe Goss
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message -----
From: "Tony Caught" <caute@optusnet.com.au>
To: <pianotech@ptg.org>
Sent: Friday, May 24, 2002 8:35 AM
Subject: Re: Bass string winding Tension


> Hi Newton,
>
> 60% of the strings tension when it is up to full tension in the piano.
>
> We all know that the string will stretch as we increase the tension on the
> string, by as much as 10 millimetre or more.  Whilst this is happening the
> copper windings theoretically should be parting by a '.' amount.  Now if
the
> string when tuned has 80 kilo of tension and has stretched 10mm then :
>
> If the string was wound at 40 kilo tension with a stretch of 5mm then the
> '.' gap would be wider than if the string was wound at 48 kilo (60%) with
a
> stretch of perhaps 3mm.
>
> I would think that a string wound at a higher tension would require less
> twist than the string wound at the lower tension.
>
> But there must be a point where if you have too much tension (say 80 kilo)
> that the copper wire would be crushed when the tension is released and the
> string shrinks.
>
> Possibly the right tension is that one that causes the string to not hang
> straight. ?
>
> Hope you understand what I am trying to say.
>
> Regards
>
> Tony
>
>
>
> > You are getting into some of the arcane aspects of string making.
> >
> > First, some string winders "straighten" the wire as it comes off the
> coils.
> > Some do not, thinking that curve is important to the quality of their
> strings.
> > The copper, which is not all the springy, will not impart much of a
twist
> to the
> > string when hanging loose.
> >
> > 60% of what?  Your question, as stated, is not clear.  You do not want
to
> exceed
> > 65% of the breaking point of that size of wire.  This does not happen
> often but
> > it can on big pianos and on the tiny ones with real heavy wraps.
> >
> > Newton
>
>
> Tony Caught
> Darwin
> Australia
> caute@optusnet.com.au
>
>
>
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